一种在水中剥离硝插层 MgAl 层状双氢氧化物的新方法及其在废水中去除重金属的应用。
A novel method to delaminate nitrate-intercalated MgAl layered double hydroxides in water and application in heavy metals removal from waste water.
机构信息
Graduate School of Environmental Studies, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan; Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh.
Graduate School of Environmental Studies, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan.
出版信息
Chemosphere. 2018 Jul;203:281-290. doi: 10.1016/j.chemosphere.2018.03.166. Epub 2018 Mar 28.
Nitrate-intercalated MgAl layered double hydroxide (LDH) was successfully delaminated in water by a facile and effective method upon reflux at 120 °C for 24 h followed by sonication at 40 °C for 5 h. This process is environmentally friendly since water is the only solvent used. The delaminated nanosheets were characterized by microscopic, spectroscopic, and particle size analyses. The delamination process successfully produced octahedron-shaped single-layer nanosheets 50-150 nm in size. X-ray photoelectron spectroscopy (XPS) data confirmed that the surface elements and their chemical status are consistent with the basic layer of MgAl LDH. The delaminated nanosheets displayed higher adsorption capacity for removing heavy metals from waste water than the original powdered LDH. After treating the waste water, a sharp and intense peak in the X-ray powder diffraction (XRD) pattern of the precipitate confirms the restacking of the LDH nanosheets.
硝酸根插层镁铝层状双氢氧化物（LDH）在 120°C 回流 24 小时后，通过简便有效的方法在水中成功剥离，然后在 40°C 下超声 5 小时。由于仅使用水作为溶剂，因此该过程是环保的。剥离的纳米片通过微观、光谱和粒度分析进行了表征。剥离过程成功地制备了大小为 50-150nm 的八面体形状的单层纳米片。X 射线光电子能谱（XPS）数据证实，表面元素及其化学状态与 MgAl LDH 的基本层一致。剥离的纳米片在去除废水中重金属方面的吸附能力高于原始粉末状 LDH。处理废水后，沉淀物的 X 射线粉末衍射（XRD）图谱中尖锐而强烈的峰证实了 LDH 纳米片的再堆积。
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